EP2341034A1 - Réduction de la teneur en métal lourd d'eaux usées dans une étape biologique et station d'épuration - Google Patents

Réduction de la teneur en métal lourd d'eaux usées dans une étape biologique et station d'épuration Download PDF

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Publication number
EP2341034A1
EP2341034A1 EP20100194986 EP10194986A EP2341034A1 EP 2341034 A1 EP2341034 A1 EP 2341034A1 EP 20100194986 EP20100194986 EP 20100194986 EP 10194986 A EP10194986 A EP 10194986A EP 2341034 A1 EP2341034 A1 EP 2341034A1
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EP
European Patent Office
Prior art keywords
oxygen
wastewater
heavy metal
zones
biological
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP20100194986
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German (de)
English (en)
Inventor
Günther Kern
Achim Böhm
Michael Alter
Joachim Hansen
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BASF SE
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BASF SE
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Filing date
Publication date
Application filed by BASF SE filed Critical BASF SE
Priority to EP20100194986 priority Critical patent/EP2341034A1/fr
Publication of EP2341034A1 publication Critical patent/EP2341034A1/fr
Withdrawn legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/006—Regulation methods for biological treatment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/1236—Particular type of activated sludge installations
    • C02F3/1263—Sequencing batch reactors [SBR]
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/301—Aerobic and anaerobic treatment in the same reactor
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/20—Heavy metals or heavy metal compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/20—Heavy metals or heavy metal compounds
    • C02F2101/22—Chromium or chromium compounds, e.g. chromates
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/001—Upstream control, i.e. monitoring for predictive control
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/003—Downstream control, i.e. outlet monitoring, e.g. to check the treating agents, such as halogens or ozone, leaving the process
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/02—Temperature
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/06—Controlling or monitoring parameters in water treatment pH
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/14—NH3-N
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/15—N03-N
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/21—Dissolved organic carbon [DOC]
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/22—O2
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/02—Fluid flow conditions
    • C02F2301/028—Tortuous
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/302—Nitrification and denitrification treatment
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Definitions

  • the present invention relates to a method for reducing the heavy metal content of wastewater in a biological stage of a sewage treatment plant while maintaining a given maximum level for the ammonium content of the wastewater after the biological stage.
  • the invention relates to a sewage treatment plant having at least one biological stage, with measuring devices and adjusting devices and a process control system for carrying out the method according to the invention.
  • An important class of pollutants are heavy metals such as copper, nickel, zinc, lead, chromium or cadmium, which may be present in both municipal and industrial effluents in different compositions and concentrations.
  • Floats and suspended solids and settleable impurities are usually separated in physical stages, for example in computer systems, sand traps or settling tanks. Depending on the requirements, other physical processes are also used, such as adsorption, filtration or stripping.
  • biological stages organic substances are usually degraded in the wastewater with the help of microorganisms and organically bound nitrogen and ammonium are largely removed by bacterial nitrification and denitrification.
  • a frequently used biological process is the activated sludge process, in which impurities are biodegraded in a so-called activated sludge tank by aerating wastewater mixed with activated sludge.
  • the chemical processes include, for example, neutralization, oxidation / reduction or precipitation.
  • adjuvants are frequently used, e.g. Sodium hydrogen sulfide, organo-sulfides or iron salts as precipitant to bind pollutants such as heavy metals or phosphorus and remove it from the sewage.
  • a disadvantage of the known method is that they are often complex and associated with high costs. As a rule, auxiliaries are needed which are to be separated off with the Components enter compounds that need to be separated in additional process steps and apparatus. Moreover, in the case of chemical precipitation, the problem may arise that the precipitation products are very fine, so that separation from the waste water or the sludge can only be achieved at great expense.
  • the invention described below was based on the object of providing a method which ensures reliable and simple reduction of the heavy metal content of waste water.
  • a method for reducing the heavy metal content of wastewater in a biological stage of a sewage treatment plant while maintaining a given maximum level for the ammonium content of the wastewater after the biological stage, wherein the oxygen concentration is minimized during the nitrification phase, depending on current process conditions.
  • a sewage treatment plant comprising at least one biological stage with measuring devices and control devices and a process control system that is connected in terms of information technology with the measuring and control devices, the process control system is set up so that the inventive method are operated essentially automated can.
  • the process according to the invention can be implemented in a wide variety of sewage treatment plants as long as they have a biological stage in which the processes of nitrification and denitrification proceed.
  • the biological stage can be operated continuously by wastewater is continuously fed to the pool and removed. However, it can also be operated discontinuously by filling a basin with waste water, interrupt the feed, drain the biological processes, and finally empty the basin before a new cycle begins.
  • buffer tanks are usually required to buffer the incoming wastewater.
  • the heavy metal content of effluents flowing into a sewage treatment plant depends on the sources from which the sewage originates. They can be essentially constant over time, for example if they are predominantly municipal wastewater. However, they can also fluctuate periodically or aperiodically, for example in the case of waste water from industrial plants which, due to their production, release wastewater containing heavy metals in certain time cycles, e.g. in batchwise operated production processes. Fluctuations in heavy metal contents may also arise due to daytime or seasonal cycles.
  • a heavy metal is cadmium, which is predominantly present in wastewater streams from mining companies or pigment manufacturing plants.
  • communal Wastewater is often found in the heavy metals copper and zinc, which are mainly discharged into the wastewater through the removal of pipes or other objects such as gutters or containers.
  • the wastewater to be purified passes through one or more nitrification phases, during which the microorganisms convert nitrogen and ammonium, which are organically bound, into nitrate with continuous supply of oxygen.
  • the oxygen supply can take place in the form of elementary oxygen or in the form of oxygen-containing gases, for example air.
  • a methodology with elemental oxygen may offer advantages in terms of efficiency and tank volume required, whereas air-conditioning may have cost advantages.
  • the nitrification phase can be defined in terms of time, space or combined.
  • a nitrification phase can be defined, for example, by dosing oxygen into one or more basins of the biological stage in a time-intermittent manner. Periods of oxygen dosing during which nitrification may take place alternate with periods of no oxygenation in which denitrification may occur.
  • a nitrification phase can be defined, for example, in that in at least one basin of the biological stage two or more zones are present, of which at least one is permanently supplied with oxygen.
  • zones in a basin can be delimited from one another by allowing ventilation with different volumetric flows of oxygen or oxygen-containing gas.
  • nitrification may take place.
  • the primary objective of wastewater treatment in the biological stage is the decomposition of organic carbon compounds and inorganic nitrogen compounds.
  • the reduction of the inorganic nitrogen compounds in the effluents is mainly achieved by an appropriate design of the tank volumes as well as the nitrification phases and denitrification phases, among other things by the amount and duration of the supplied oxygen.
  • the values for the dissolved oxygen in the biological stage are typically in the range of 0 to 4 mg / l.
  • maximum levels for the ammonium and nitrate content of the effluent after the biological stage can normally be ensured.
  • a common maximum level for inorganic nitrogen compounds in the effluent of a wastewater treatment plant is currently 20 milligrams per liter (mg / l).
  • the invention is also pursued in the biological stage as another goal to reduce the heavy metal content in the wastewater. This can be achieved by minimizing the oxygen concentration during the nitrification phase, depending on current process conditions. However, the oxygen supply may only be reduced to the extent that sufficient oxygen is still available for the process of nitrification in order to be able to reliably comply with the maximum levels for the ammonium content of the wastewater after the biological stage.
  • the oxygen concentration at the end of the nitrification phase is preferably from 0 to 2 mg / l, more preferably from 0.5 to 1 mg / l of dissolved oxygen.
  • a temporal definition thereof is to be understood as the last period of time.
  • this period of time is at most one third, more preferably at most a quarter, in particular at most one fifth of the total duration of the nitrification phase.
  • the end of the nitrification phase is the last pool volume that passes through the wastewater before leaving the nitrification phase.
  • this last pelvic volume is at most one third, more preferably at most a quarter, in particular at most one fifth of the total pelvic volume of the nitrification phase.
  • Current process conditions may be, for example: concentrations of oxygen, ammonium, nitrate, heavy metal or DOC (dissolved organic carbon).
  • the pH or the temperature of the wastewater can also be current process conditions.
  • the conditions can be detected at different points in the treatment plant, for example in one or more zones of a basin, but also in inlet or outlet pipes of different basins.
  • Conventional measuring devices can be used to detect the process conditions, for example pH electrodes, ion-sensitive sensors or sensors for detecting the oxygen concentration, e.g. based on optical measuring principles.
  • the oxygen concentration during the nitrification phase can advantageously be influenced by regulating the oxygen supply to one or more zones of an aeration tank.
  • the oxygen supply can be done in different ways.
  • there are aerators in the aeration tank such as centrifugal aerators or roller aerators whose main task is to provide a flow in the basin and thus the transport of the wastewater through the basin.
  • the aerators bring design-based air and thus a basic amount of oxygen in the wastewater.
  • the control of the oxygen concentration is carried out in this embodiment by means of which elemental oxygen, air or other oxygen-containing gas is introduced specifically into the wastewater.
  • membrane aerators for example in the form of ventilation mats, disk ventilators or nozzles such as jet nozzles, propulsion jet nozzles or injector systems.
  • the delivery of the wastewater takes place without appreciable entry of air into the wastewater, for example by means of so-called submersible mixers.
  • the oxygen supply takes place in this case almost exclusively by means of the above-mentioned type, for example, membrane aerators.
  • different zones are supplied with different amounts of oxygen.
  • the ventilation of some zones can also be completely omitted, whereby the nitrification phase is reduced. This can have a positive effect on the reduction of the heavy metal content.
  • At least one biological stage basin has two or more zones, the last zone viewed in the flow direction of the waste water being supplied with less oxygen than the penultimate zone, depending on current process conditions.
  • An essential process condition is the ammonium content of the effluent flowing into the last zone. The ammonium content must not exceed the specified limit at this point.
  • Another important process condition is the heavy metal content, which should be reduced. It is preferably determined in the drain from the tank or in the drain from the sewage treatment plant.
  • an expert system is used as software in which rules are stored that generate setpoints for manipulated variables on the basis of current process conditions.
  • Such expert systems are commercially available and can be based on different methods, such as fuzzy logic. Relevant current process conditions can be recorded as described above with known measuring devices.
  • adjusting devices are advantageously selected those which have a direct influence on the ventilation or oxygen supply in the individual zones of the basin. These may be direct adjusting devices such as the mass flow of oxygen to a ventilation device or the speed of a centrifugal aerator. However, it can also be a specification for a subordinate control loop, for example a specification for the oxygen concentration to be set in a zone of the basin.
  • the form in which the rules are defined depends on the specific software used. Usually such rules are formulated as if-then relationships, for example, via mathematical inequalities and conditional links.
  • the expert system can be used on different hardware systems.
  • the expert system is installed on a commercial workstation having communication facilities through which signals can be exchanged with the measurement and control equipment.
  • the computer communicates via standardized input / output interfaces, such as signal converter cards, directly with the Measuring devices and the adjusting devices or regulators with which the adjusting devices are provided, eg compact controller.
  • a further embodiment according to the invention provides that the workstation on which the expert system is installed communicates via an interface with the PLS, which in turn sends signals to the measuring system - exchanged and adjusting devices.
  • the invention also includes hybrid forms in which part of the information flow between the expert system, on the one hand, and measuring and control devices, on the other hand, takes place directly and another part indirectly via the PLS.
  • the rules of the expert system are implemented in function blocks of the process control system, so that a separate workstation can be dispensed with.
  • the expert system can be set up in such a way that it determines proposals for new setpoints on the basis of current process conditions and the stored rules, and these suggestions are displayed in text form or in graphic form to the plant operator. The plant operator can then decide whether he accepts the suggestions of the expert system and passes the setpoints to the control devices in the system.
  • the expert system can also be set up such that part or all of the proposed setpoint values are automatically forwarded to the relevant setting devices without the action of a system operator being required.
  • the expert system is set up such that the method according to the invention runs at least partially automatically on a process computer.
  • the process computer can be, for example, a workstation or a process control system.
  • the inventive method is characterized by the fact that it manages without complex constructions, additional plant parts or chemical auxiliaries.
  • the investment and operating costs are therefore significantly lower than in known methods for heavy metal reduction.
  • the method according to the invention is flexible and can easily be adapted, for example, to changes in the boundary conditions for the operation of a system.
  • Fig. 1 an aeration tank 1 is shown, the wastewater via feeds 3a and / or 3b can be supplied. Furthermore, the tank 1 has a return sludge inlet 4, via which the required microorganisms are supplied in the return sludge.
  • the basin 1 is provided with separation devices 2, which provide in conjunction with centrifugal aerators 6 for a defined flow of the wastewater stream. Purified wastewater leaves the tank 1 via a drain 5.
  • centrifugal aerators 6 other conveyors such as submersible mixers can be used.
  • longitudinal shape inventive aeration tank 1 may also have other shapes, such as circular, elliptical or oval.
  • the separation devices 2 can be permanently installed or loose. Examples are walls, walls or baffles.
  • Fig. 2 shows the aeration tank Fig. 1 with ventilation mats 7 therein as an example of means for supplying the individual zones with oxygen.
  • the individual ventilation mats 7 can be of different shape and size and are advantageously adapted to the prevailing in the respective zone oxygen demand.
  • the oxygen flow through individual ventilation mats 7 or groups of ventilation mats 7 can be individually controlled in order to influence the oxygen supply of the various zones in a targeted manner.
  • Fig. 3 is an aeration tank according to Fig. 1 represented, which is divided into five zones.
  • the first zone 10 in the direction of flow is not ventilated, so that denitrification of the waste water can take place there.
  • the other zones 11, 12, 13 and 14 can be vented independently to influence the process of nitrification.
  • Examples of means for ventilation the sake of clarity in Fig. 3 not shown, are ventilation mats 7 according to Fig. 2 .
  • Measuring devices 8 for determining the oxygen concentration are installed in the zones.
  • one or more measuring devices 9 may be provided for determining the ammonium content, for example in the zones 11, 12 or 13.
  • at least one such measuring device 9 is mounted in the fourth zone 13.
  • the oxygen supply in the zones 11, 12 and 13, and in particular in the fifth zone 14 can be throttled. Due to the throttling, a lower oxygen concentration is established in the fifth zone 14, as a result of which re-dissolution of the heavy metal is largely avoided. If further measuring devices 9 for determining the ammonium content are present, for example in zones 11 and 12, then these can advantageously be used to regulate the oxygen supply in the various zones.
  • the sewage treatment plant of BASF SE at the Ludwigshafen site has been expanded for around 6.2 million PE BSB and has been in operation since 1974.
  • three cities and municipalities are also connected.
  • the proportion of municipal burden is around 15%.
  • the wastewater is collected on the BASF site, neutralized there and pumped via a pumping station to the sewage treatment plant. After the computer system and primary treatment, the wastewater is distributed in a distribution structure to five activation tanks.
  • the aeration tanks are built as covered carousel pools and equipped with centrifugal aerators and a pure oxygen aeration for ventilation. Each aeration road is assigned to three secondary clarifiers.
  • the purified wastewater flows into the Rhine. The resulting excess sludge is concentrated in the thickeners and fed to the mechanical dewatering of a combustion.
  • the treatment plant is equipped with various measuring devices whose signals to a
  • PLS Process control system
  • an expert system was developed and installed on a standard workstation computer, which communicates with the PLS via an OPC interface (OLE for Process Control). Based on online measurement data and off-line data such as dry matter contents in the aeration tanks or sludge volumes, the expert system generates suggestions for the optimal setting of relevant operating parameters of the wastewater treatment plant using knowledge-based elements and fuzzy logic.
  • the setpoint values proposed by the expert system are displayed to the operators in the control room via the OPC interface, which in turn can evaluate and implement the suggestions.
  • setpoints can also be automatically transferred to the PLS without the need for manual intervention. This option was used for the biological level oxygen regulators.
  • the hydraulic residence time is the quotient of the volume of a zone of the aeration tank and the volume flow flowing through this volume Understood.
  • the mass flow usually includes the raw water to be clarified and a proportion of return sludge.
  • FIG. 3 schematically shows an aeration tank 1 after the changes.
  • the wastewater to be clarified is fed via the inlets 3a and 3b, the return sludge via the return sludge inlet 4 of the denitrification zone 10.
  • the wastewater then flows through four ventilation zones 11 to 14, before it leaves the basin via the outlet 5.
  • Measuring systems 8 are installed in the zones, which provide information about the oxygen concentration online.
  • a measuring device 9 for the online determination of the ammonium content was additionally attached.
  • the measuring devices are located predominantly in the rear regions of the respective zones, as viewed in the direction of flow.
  • the copper content is recorded in a measuring device, which is located in the overall course of the aeration tank 1 belonging NachNeillbecken (in Fig. 3 not shown).
  • an optimal sludge age was determined and set in the aeration streets.
  • the minimization of oxygen concentrations in the aeration zones of the activated sludge tanks was laid down as a set of rules.
  • the rules provide for the oxygen supply to the ventilation zones 11, 12, 13 and in particular for the ventilation zones 14 of the activated sludge basins 1, as seen in the direction of flow, to be increased or decreased or, if necessary, also switched off entirely.
  • the plant was converted in 2006 and implemented the measures described above.
  • the following table shows daily mean values of the copper concentration in the effluent of the treatment plant over characteristic periods in the summer and winter months, normalized to the maximum value in the winter period 2004/2005.

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  • Life Sciences & Earth Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Microbiology (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Molecular Biology (AREA)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
  • Activated Sludge Processes (AREA)
EP20100194986 2009-12-18 2010-12-14 Réduction de la teneur en métal lourd d'eaux usées dans une étape biologique et station d'épuration Withdrawn EP2341034A1 (fr)

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EP20100194986 EP2341034A1 (fr) 2009-12-18 2010-12-14 Réduction de la teneur en métal lourd d'eaux usées dans une étape biologique et station d'épuration

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EP09179809 2009-12-18
EP20100194986 EP2341034A1 (fr) 2009-12-18 2010-12-14 Réduction de la teneur en métal lourd d'eaux usées dans une étape biologique et station d'épuration

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015143159A1 (fr) * 2014-03-21 2015-09-24 Parkson Corporation Appareil de traitement des eaux usées avec commande à double niveau, système de commande à double niveau et procédé de traitement

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4140544A1 (de) 1991-12-09 1993-06-17 Henkel Kgaa Verbessertes verfahren zur entfernung von schwermetallrestgehalten und gegebenenfalls vorliegenden organischen ballaststoffen aus waessrigen phasen
US5626755A (en) * 1995-11-08 1997-05-06 Micronair, Inc. Method and apparatus for waste digestion using multiple biological processes
US5906746A (en) * 1995-05-11 1999-05-25 Biobalance A/S Method for the control of biodegradation
US6689274B1 (en) * 2000-11-10 2004-02-10 Bion Technologies, Inc. Low oxygen organic waste bioconversion system
WO2007012181A1 (fr) * 2005-07-25 2007-02-01 Zenon Technology Partnership Appareil et procede de traitement de liquides de purge de desulfuration des gaz de combustion ou de liquides similaires

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4140544A1 (de) 1991-12-09 1993-06-17 Henkel Kgaa Verbessertes verfahren zur entfernung von schwermetallrestgehalten und gegebenenfalls vorliegenden organischen ballaststoffen aus waessrigen phasen
US5906746A (en) * 1995-05-11 1999-05-25 Biobalance A/S Method for the control of biodegradation
US5626755A (en) * 1995-11-08 1997-05-06 Micronair, Inc. Method and apparatus for waste digestion using multiple biological processes
US6689274B1 (en) * 2000-11-10 2004-02-10 Bion Technologies, Inc. Low oxygen organic waste bioconversion system
WO2007012181A1 (fr) * 2005-07-25 2007-02-01 Zenon Technology Partnership Appareil et procede de traitement de liquides de purge de desulfuration des gaz de combustion ou de liquides similaires

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015143159A1 (fr) * 2014-03-21 2015-09-24 Parkson Corporation Appareil de traitement des eaux usées avec commande à double niveau, système de commande à double niveau et procédé de traitement

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